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Abstract
In certain strains of inbred mice, hepatic aryl hydrocarbon hydroxylase (AHH) activity is induced by parenteral injection of the carcinogen 3-methylchol-anthrene, whereas in other strains AHH activity is not induced. In most genetic crosses between inducible and noninducible strains, inducibility segregates as a single autosomal dominant gene. However, in crosses between strains C3H/HeJ (inducible) and DBA/2J (noninducible), inducibility segregates as a single gene and in an additive manner, with the inducibility of hybrid animals falling between that of the inducible parent and that of the noninducible parent. In crosses between strains C57BL/6J (inducible) and DBA/2J (the same noninducible parent crossed to C3H/HeJ), inducibility segregates as a dominant gene. This suggests that the genes responsible for inducibility of AHH in strains C3H/HeJ and C57BL/6J are not identical. Whether they represent different alleles at the same genetic locus or genes at different loci has not been determined.
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